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Since BMW and Formula 1 were mentioned, it's worth to remind BMW was the last engine supplier to have ever used a production-based engine. AFAIK it was also the last 4-pot to race at Formula 1, and was more plagued by turbo-lag than some V6 counterparts which resorted to a pair of smaller turbochargers instead of a larger single one.
Well, even though I wouldn't hold my breath for another production engine to be turned into a Formula 1 powerplant, maybe a more effective turbo-lag mitigation can increase the acceptance not only of downsizing in general but also of a smaller amount of cylinders within some random displacement range, such as the 2.7L engines fitted to the 4-cyl Silverado and the V6 F-150.
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